The loopback interface provides a stable address for protocols (eg BGP, Telnet) to use so that they can avoid any impact if a physical interface goes down.The loopback interface is not associated with any particular vlan, it's local to the device itself as an "internal" interface that needs to
be routed to (within the device), to reach it.
best way to implement this is :
Set it up with a /32 netmask on each device, allocate them in an ordinal fashion in the same classful network that doesn't overlap with any of
your existing network ranges. Each device will need to route the assigned /32 address to the loopback interface, you will need some form
of static or dynamic route to do this. A dynamic routing protocol is best as you'll end up going mad adding dozens of /32 static routes
throughout your network
What's the best practice for switches management -
Create separate management VLAN, do trunks between all switches, and assign all switches management interface to this VLAN.
There are many uses,, these are main ones,, i thnk
